Zobrazeno 1 - 10
of 25
pro vyhledávání: '"D. B. Sellen"'
Autor:
P. M. Burne, D. B. Sellen
Publikováno v:
Biopolymers. 34:371-382
A study of gellan has been made using the technique of photon correlation spectroscopy. It has been confirmed that gellan gels are largely stationary at a molecular level like other polysaccharide gels and quite unlike the gels of flexible polymers s
Autor:
D. B. Sellen, T. K. Attwood
Publikováno v:
Biopolymers. 29:1325-1328
Autor:
D. B. Sellen
Publikováno v:
SPIE Proceedings.
Light scattered from all gel systems is non-ergodic, i.e., only partial spectral broadening occurs and the scattered speckle pattern has a stationary component. Autocorrelation functions in general have both homodyne and heterodyne components, but re
Autor:
D. B. Sellen, P. M. Burne
Publikováno v:
SPIE Proceedings.
Several authors have investigated the Rayleigh linewidth of light scattered from thegels of cross—linked flexible polymers such as polyacrylamide14. The width of thespectral broadening varies as sinL(O/2), and diffusion coefficients may becalculate
Autor:
P. M. Burne, D. B. Sellen
Publikováno v:
Biochemical Society transactions. 19(2)
Autor:
N. M. D. Brown, D. B. Sellen, C. D. Flint, A. A. Herod, G. Duxbury, D. A. Dunmur, M. N. R. Ashfold
Publikováno v:
Journal of the Chemical Society, Faraday Transactions. 90:1357
Autor:
D. B. Sellen
Publikováno v:
British Polymer Journal. 18:28-31
Studies of the diffusion of globular proteins and dextran fractions within polysaccharide and poly-acryamide gels by laser light scattering are described. Gels of stiff polysaccharide chains scatter light which exhibits little spectral broadening, si
Autor:
D. B. Sellen, P. Y. Key
Publikováno v:
Journal of Polymer Science: Polymer Physics Edition. 20:659-679
Diffusion coefficients of dextran fractions within agarose gels surrounded by dextran solution have been measured by laser light scattering using the autocorrelation method. Plots were made of the diffusion coefficient relative to that in dilute solu
Publikováno v:
Biopolymers. 27:201-212
Electron microscopy has been carried out on sections of beaded agarose with a wide range of thicknesses, and the results have been analyzed by means of stereological theory using computer graphics. The results agree with a randomly orientated system
Autor:
D. B. Sellen
Publikováno v:
Journal of Experimental Botany. 34:681-687
Expressions for the various types of strain in a thin walled cylindrical cell resulting from internal pressure, are derived for the general case where the cell axis does not correspond to one of the axes of mechanical symmetry. It is shown that where